Question

您好当我尝试使用JNDI连接到数据源时，我收到此错误：

    [org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null'
    at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createConnectionFactory(BasicDataSource.java:1452)
    at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1371)
    at org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)
    at org.apache.roller.weblogger.business.DatabaseProvider.getConnection(DatabaseProvider.java:179)
    at org.apache.roller.weblogger.business.DatabaseProvider.<init>(DatabaseProvider.java:141)
    at org.apache.roller.weblogger.business.startup.WebloggerStartup.prepare(WebloggerStartup.java:171)
    at org.apache.roller.weblogger.ui.core.RollerContext.contextInitialized(RollerContext.java:138)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4205)
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4704)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:799)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:779)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:601)
    at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1079)
    at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:1002)
    at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:506)
    at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1315)
    at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:324)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1061)
    at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
    at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
    at org.apache.catalina.core.StandardService.start(StandardService.java:525)
    at org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Caused by: java.lang.NullPointerException
    at sun.jdbc.odbc.JdbcOdbcDriver.getProtocol(JdbcOdbcDriver.java:507)
    at sun.jdbc.odbc.JdbcOdbcDriver.knownURL(JdbcOdbcDriver.java:476)
    at sun.jdbc.odbc.JdbcOdbcDriver.acceptsURL(JdbcOdbcDriver.java:307)
    at java.sql.DriverManager.getDriver(DriverManager.java:253)
    at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createConnectionFactory(BasicDataSource.java:1437)
    ... 30 more]

context.xml中

<Context path="/roller" docBase="c:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\roller" debug="0">
    <Resource name="jdbc/rollerdb" auth="Container"
        type="javax.sql.DataSource"
        driverClassName="com.mysql.jdbc.Driver"
        url="jdbc:mysql://localhost:3306/rollerdb?autoReconnect=true&amp;useUnicode=true&amp;characterEncoding=utf8-&amp;mysqlEncoding=utf8"
        username="roller_user"
        password="password"
        maxActive="20" maxIdle="3" removeAbandoned="true"
        maxWait="3000" 
    />
    <Resource name="mail/Session"
        auth="Container"
        type="javax.mail.Session"
        username="username@gmail.com"
        password="password"
        mail.debug="false"
        mail.user="username@gmail.com"
        mail.password="password"
        mail.smtp.from="username@gmail.com"
        mail.transport.protocol="smtp"
        mail.smtp.port="465"
        mail.smtp.host="smtp.gmail.com"
        mail.smtp.auth="true"
        mail.smtp.starttls.enable="true"
        mail.smtp.socketFactory.port="465"
        mail.smtp.socketFactory.class="javax.net.ssl.SSLSocketFactory"
        mail.smtp.socketFactory.fallback="false" 
    />
</Context>

的web.xml

<web-app .. >
...
    <!-- jndi resources -->
    <resource-ref>
        <res-ref-name>jdbc/rollerdb</res-ref-name>
        <res-type>javax.sql.DataSource</res-type>
        <res-auth>Container</res-auth>
    </resource-ref>

    <resource-ref>
        <res-ref-name>mail/Session</res-ref-name>
        <res-type>javax.mail.Session</res-type>
        <res-auth>Container</res-auth>
    </resource-ref>

</web-app>

roller-custom.properties

installation.type=auto
database.configurationType=jndi
database.jndi.name=jdbc/rollerdb
mail.configurationType=jndi
mail.jndi.name=mail/Session

我在tomcat的lib diectory中有mysql-connector-java-5.1.15-bin.jar，activation.jar和mail.jar，在tomcat的webapps文件夹中有web应用程序。

我无法理解我在这里做错了什么。有人能帮助我理解我在这里缺少什么吗？

感谢。

Answer 1

我刚刚遇到类似的错误，结果发现我的context.xml文件略有损坏。我认为这很可能是问题所在。

我在比较我和你之间的context.xml文件时的建议，我说试试这个

driverClass

取代

driverClassName

Answer 2

我已经解决了这个问题，改变了导入引用（在我的例子中）：

import org.apache.tomcat.dbcp.dbcp.BasicDataSource;

到

import org.apache.commons.dbcp.BasicDataSource;

我的错误是因为我总是使用CRTL + o进行导入引用，当我进行导入时，我的引用中没有.jar。我希望这可能对其他人有用。

Answer 3

如果您的Tomcat版本不同，您也可能会遇到此错误..然后您的context.xml必须看起来不同...有关详细信息，请转到此页面..a必须阅读此问题：

http://www.crazysquirrel.com/computing/java/connection-pooling.jspx

暂存器 Karthic

Answer 4

在我的案例中帮助了以下更改：在APPLICATION_PATH / WebContent / META_INF / context.xml中

旧代码：

<resource name="jdbc/internships_db" auth="Container" type="javax.sql.DataSource">
    <param name="username" value="my_user" />
    <param name="password" value="my_password" />
    <param name="url" value="jdbc:mysql://localhost:3306/internships_db" />
</resource>

新代码：

<Resource name="jdbc/internships_db"
    auth="Container"
    type="javax.sql.DataSource"
    maxActive="100"
    maxIdle="30"
    username="my_user"
    maxWait="10000"
    driverClassName="com.mysql.jdbc.Driver"
    password="my_password"  
    url="jdbc:mysql://localhost:3306/internships_db"/>

Jdbc-Driver类放在路径下 /user_path/tomcat-instance_path/webapps/app_name/WEB-INF/lib/com.mysql.jdbc_5.1.5.jar

org.apache.tomcat.dbcp.dbcp.SQLNestedException：无法为连接URL'null'创建类''的JDBC驱动程序

4 个答案: